I am getting a full frame [51B] of raw bytes from a device connected to TTN. For that purpose, an Uplink TTN node is connected to TTN in Node-Red screen. If I pass the results directly to the debug node, I can see the contents of bytes buffer in the Node-Red debug window. My aim is to get access t…

Ok well now I'm stumped. It seems msg.payload IS actually a buffer. After all that nonsense. Look at payload - it IS what you wanted - tempC = 49 You can pretty much delete the majority of the function node code and get values directly from msg.payload[0].

Many people struggle with byteswapping and data conversion (search this forum and you will see the deluge of requests for help) & generating a single object with 1 or more values, some int, some uint, some want booleans, some float, some int64. Then there are those who need multiple values or object…

Steve, All what I really need is a pece of working code that allows to access buffer of bytes in the Node-Red. Manipulating with this is another story. I tried something like this: var b0 = msg.payload.buffer[0]; It doesn't generate an error but seems not to work at all. On the other hand, I …

[image] spark57: var b0 = msg.payload.buffer[0]; What do you do with b0 ? Do you add it to the msg and return the msg?

This is just a sample showing how I try to access this buffer of bytes. In fact, the code is a little bit more complex. In a short, the code in Function node looks as follows: var newp = {'tempC': 3, tempF: ""}; // The <<3>> is just to help observing whether the code works or not var b0 = msg.p…

Hi - firstly wrap code in three back ticks ``` var why = "cos it looks much better and doesnt get chewed up by forum formatting"; ``` so - try this and show us the debug nodes (set to show "complete message") results with properties expanded... if(Buffer.isBuffer(msg.payload.buffer) == false){ …

Hi Steve, I copied your code into function node and here are results: 8.05.2020, 12:16:05[node: ee9b8483.0b7228](http://localhost:1880/)function : (warn) "msg.payload.buffer is not a buffer" I also added another debug node with option to show the whole content of message: 8.05.2020, 12:16:05[nod…

Hi, i edited your post (I couldnt read it) - please put code between 3 backticks on new lines ``` Like this ``` [image] spark57: "msg.payload.buffer is not a buffer" There is your problem - as we suspected. [image] spark57: At the same time, the another debug node shows the complete …

i have another theory. Since this happens.... if(Buffer.isBuffer(msg.payload.buffer) == false){ node.warn("msg.payload.buffer is not a Buffer"); return null; //halt flow } I suspect your payload ISNT a nodejs buffer but something like a Buffer. Try this please.... node.warn(["typeof msg.pay…

Some proof that it works... [image] Your "buffer" is probably NOT a nodejs buffer the test flow... [{"id":"689990b8.38751","type":"inject","z":"c70ba4a4.e7fb58","name":"","topic":"","payload":"[47,48,42,43,44,45,46,47,48,49,50]","payloadType":"bin","repeat":"","crontab":"","once":false,"onceDel…

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Getting raw data from TTN Uplink node

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spark57 7 May 2020 11:16 10

Hi Steve,

OK, I will try it in late evening and let you know,

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Getting raw data from TTN Uplink node

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